US5611928A - Process for treating waste water - Google Patents
Process for treating waste water Download PDFInfo
- Publication number
- US5611928A US5611928A US08/454,316 US45431695A US5611928A US 5611928 A US5611928 A US 5611928A US 45431695 A US45431695 A US 45431695A US 5611928 A US5611928 A US 5611928A
- Authority
- US
- United States
- Prior art keywords
- waste water
- hydrogen peroxide
- salt
- process according
- sub
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 239000002351 wastewater Substances 0.000 title claims abstract description 55
- 238000000034 method Methods 0.000 title claims abstract description 31
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims abstract description 52
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical class [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 claims abstract description 10
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical group [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 claims description 23
- 239000011790 ferrous sulphate Substances 0.000 claims description 16
- 235000003891 ferrous sulphate Nutrition 0.000 claims description 16
- 229910000359 iron(II) sulfate Inorganic materials 0.000 claims description 16
- 239000010802 sludge Substances 0.000 claims description 12
- 150000003839 salts Chemical class 0.000 claims description 6
- 239000000126 substance Substances 0.000 description 17
- 238000001556 precipitation Methods 0.000 description 16
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 14
- 239000001301 oxygen Substances 0.000 description 14
- 229910052760 oxygen Inorganic materials 0.000 description 14
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 12
- 229910052757 nitrogen Inorganic materials 0.000 description 8
- 229910052698 phosphorus Inorganic materials 0.000 description 8
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 6
- 239000011574 phosphorus Substances 0.000 description 6
- 239000005416 organic matter Substances 0.000 description 5
- 239000007787 solid Substances 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 230000007613 environmental effect Effects 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 150000004045 organic chlorine compounds Chemical class 0.000 description 4
- 150000001875 compounds Chemical class 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 239000002244 precipitate Substances 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 238000007792 addition Methods 0.000 description 2
- 239000013256 coordination polymer Substances 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- RUTXIHLAWFEWGM-UHFFFAOYSA-H iron(3+) sulfate Chemical compound [Fe+3].[Fe+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O RUTXIHLAWFEWGM-UHFFFAOYSA-H 0.000 description 2
- 229910000360 iron(III) sulfate Inorganic materials 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 235000015097 nutrients Nutrition 0.000 description 2
- 150000002896 organic halogen compounds Chemical class 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- VGVRPFIJEJYOFN-UHFFFAOYSA-N 2,3,4,6-tetrachlorophenol Chemical class OC1=C(Cl)C=C(Cl)C(Cl)=C1Cl VGVRPFIJEJYOFN-UHFFFAOYSA-N 0.000 description 1
- ISPYQTSUDJAMAB-UHFFFAOYSA-N 2-chlorophenol Chemical compound OC1=CC=CC=C1Cl ISPYQTSUDJAMAB-UHFFFAOYSA-N 0.000 description 1
- 235000018185 Betula X alpestris Nutrition 0.000 description 1
- 235000018212 Betula X uliginosa Nutrition 0.000 description 1
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 238000005273 aeration Methods 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000031018 biological processes and functions Effects 0.000 description 1
- 238000004061 bleaching Methods 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000001311 chemical methods and process Methods 0.000 description 1
- 238000009388 chemical precipitation Methods 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000000701 coagulant Substances 0.000 description 1
- SOCTUWSJJQCPFX-UHFFFAOYSA-N dichromate(2-) Chemical compound [O-][Cr](=O)(=O)O[Cr]([O-])(=O)=O SOCTUWSJJQCPFX-UHFFFAOYSA-N 0.000 description 1
- 238000005188 flotation Methods 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 235000010755 mineral Nutrition 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 150000002978 peroxides Chemical class 0.000 description 1
- 229920000867 polyelectrolyte Polymers 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
- C02F3/12—Activated sludge processes
- C02F3/1205—Particular type of activated sludge processes
- C02F3/1215—Combinations of activated sludge treatment with precipitation, flocculation, coagulation and separation of phosphates
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/722—Oxidation by peroxides
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S210/00—Liquid purification or separation
- Y10S210/928—Paper mill waste, e.g. white water, black liquor treated
Definitions
- the invention relates to a process for treating waste water produced in the forest industry, in which process the waste water is further treated with chemicals after a biological treatment.
- the waste waters of the forest industry contain varying amounts of dissolved and solid organic and inorganic substances derived from the raw materials used.
- the waste waters thus pollute the watercourses into which they are discharged.
- Solid insoluble substances make the water turbid and form a layer of sludge on the floor of the watercourse.
- Organic substances regardless of whether they are dissolved or solid, consume oxygen from the water and directly or indirectly give it a taste or odor.
- a process based on oxidation for the treatment of waste waters is also otherwise known.
- the oxidation of waste water is carried out by using hydrogen peroxide, the oxidative action of which can be enhanced by means of a catalyst, for example, a metal ion, UV light, or ozone.
- the present invention relates to a process for the treatment of the waste waters of the forest industry, enabling the stricter licence conditions to be fulfilled.
- the process provides an efficient method of eliminating the environmental load of both matter causing biological oxygen demand and matter causing chemical oxygen demand, as well as phosphorus, nitrogen and organic halogen compounds.
- waste waters from the forest industry are first treated biologically.
- the waste waters of pulp and paper mills are directed to a biological treatment plant, for example to an activated sludge plant or an aerated pond, in which a large proportion of the small-molecular organic matter can be removed.
- the biologically treated waste water is then precipitated by means of a ferrous salt (Fe 2+ ) and hydrogen peroxide, by adding the chemicals simultaneously or almost simultaneously to the waste water.
- the ferrous salt and the hydrogen peroxide are added either simultaneously or by adding the ferrous salt first and the hydrogen peroxide immediately thereafter.
- the pH must be adjusted by means of a mineral acid, for example sulfuric acid. It is also advisable to adjust the pH before the adding of the ferrous salt.
- the pH range of the system may be 3.5-6. The optimum pH is within the range 3.7-4.2.
- the ferrous salt is preferably ferrous sulfate.
- the amount of ferrous sulfate to be added depends on the type of the waste water.
- the hydrogen peroxide used may have a concentration of 30-50%.
- the weight ratio of the ferrous salt to the hydrogen peroxide may vary within 1:0.01-1:0.3, preferably 1:0.1-1:0.2.
- the precipitate which contains impurities may be separated either by settling or by flotation with or without a polyelectrolyte.
- COD Cr stands for chemical oxygen demand measured by the dichromate method
- BOD 7 stands for biological oxygen demand within seven days, and AOX stands for organic chlorine compounds.
- Table 1 shows results of the precipitation of biologically treated waste water of a pulp mill with ferrous sulfate and hydrogen peroxide.
- Unclarified pulp and paper mill waste water which had been treated biologically and been aerated in the pond (Table 4) was precipitated in the laboratory by adding ferrous sulfate and hydrogen peroxide to the waste water. Reference precipitation was carried out by using a metal salt (ferric sulfate). The pH of the waste water after all the additions of chemicals was 3.8. The weight ratio of ferrous sulfate to hydrogen peroxide was 1:0.05. The formed precipitate was separated by settling, and the clarified water was analyzed for turbidity, COD Cr , BOD 7 , P, N, AOX, and CP (chlorophenol).
- Biologically treated pulp and paper mill waste water which had been aerated in the pond and clarified (Table 5) was precipitated in the laboratory by adding ferrous sulfate and hydrogen peroxide to the waste water. Reference precipitation was carried out by using a metal salt (ferric sulfate). The pH of the waste water after the addition of all the chemicals was 3.8. The weight ratio of ferrous sulfate to hydrogen peroxide was 1:0.05. The formed precipitate was separated by settling, and the clarified water was analyzed for turbidity, COD Cr , P, N, and AOX.
- Waste water flowing into and waste water flowing out of the activated sludge plant of a sulfate pulp mill were treated with ferrous sulfate and hydrogen peroxide.
- the ratios of the ferrous sulfate amounts to the hydrogen peroxide amounts were a) 1:0.10 and b) 1:0.20.
- the results in Table 6 show that the process is more effective in removing organic matter from biologically treated than from untreated waste water.
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Biodiversity & Conservation Biology (AREA)
- Analytical Chemistry (AREA)
- Microbiology (AREA)
- Inorganic Chemistry (AREA)
- Treatment Of Water By Oxidation Or Reduction (AREA)
- Physical Water Treatments (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
- Removal Of Specific Substances (AREA)
- Treatment Of Sludge (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Abstract
Description
TABLE 1 ______________________________________ Precipitation, with ferrous sulfate and hydrogen peroxide, of waste water taken from the overflow of the activated sludge plant of a pulp mill. Fe was added in the experiment at a rate of 160 mg/l waste water. Before After precipitation precipitation Reduction mg/l mg/l % ______________________________________ BOD.sub.7 13 3.3 75 COD.sub.Cr 730 100 86 AOX 20.1 2.5 88 N 2.87 0.44 85 P 1.04 0.04 96 Color number 2180 40 98 ______________________________________
TABLE 2 ______________________________________ Reduction (%) of COD, AOX, nitrogen (N), and phosphorus (P) in the total waste water of a pulp plant in precipitation with ferrous sulfate and hydrogen, before and after the activated sludge plant (ASP). Ferrous COD.sub.Cr AOX N P Waste kg/kg reduction reduction reduction reduction water COD.sub.Cr % % % % ______________________________________ Birch 2.5 64 66 95 96 before ASP Birch 1.7 61 64 92 92 before ASP Birch 1.5 85 84 85 97 after ASP Birch 1.1 72 70 69 96 after ASP ______________________________________
TABLE 3 ______________________________________ Fe.sup.2+ H.sub.2 O.sub.2 COD.sub.Cr N P Reduction % mg/l mg/l mg/l mg/l mg/l COD N P ______________________________________ Original -- -- 750 3.81 0.49 -- -- -- waste water Anaerobic 105 45 no precipitation occurs Anaerobic 105 60 no precipitation occurs Aerated 105 45 290 1.46 0.02 61 62 96 ______________________________________
TABLE 4 ______________________________________ Results for unclarified waste water Reduction % Property Initial level FS + H.sub.2 O.sub.2 Metal salt ______________________________________ Turbidity 116 NTU 97 75 COD.sub.CR 550 mg/l 78 68 BOD.sub.7 30 mg/l 83 >83 P.sub.tot 1.3 mg/l 97 84 N.sub.tot 9 mg/l 89 67 AOX 3.03 mg/l 67 36 CP 0.112 mg/l 23 0 ______________________________________
TABLE 5 ______________________________________ Results for clarified waste water Reduction % Property Initial level FS + H.sub.2 O.sub.2 Metal salt ______________________________________ Turbidity 126 NTU 98 97 COD.sub.CR 505 mg/l 92 89 P.sub.tot 1.6 mg/l 94 88 N.sub.tot 8 mg/l 88 50 AOX 2.8 mg/l 83 65 ______________________________________
TABLE 6 ______________________________________ Results before and after the activated sludge plant Reduction % Ferrous sulfate COD.sub.Cr Turbidity Waste water mg/mg COD.sub.Cr a b a b ______________________________________ Before ASP 0.77 3 59 0 96 0.5 62 69 96 93 2.3 64 74 92 92 After ASP 0.86 79 81 90 85 1.7 88 -- 96 -- 2.6 91 -- 79 -- ______________________________________
Claims (8)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FI925506 | 1992-12-04 | ||
FI925506A FI97219C (en) | 1992-12-04 | 1992-12-04 | Waste water purification process |
PCT/FI1993/000524 WO1994013591A1 (en) | 1992-12-04 | 1993-12-03 | Process for treating waste water |
Publications (1)
Publication Number | Publication Date |
---|---|
US5611928A true US5611928A (en) | 1997-03-18 |
Family
ID=8536331
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US08/454,316 Expired - Lifetime US5611928A (en) | 1992-12-04 | 1993-12-03 | Process for treating waste water |
Country Status (9)
Country | Link |
---|---|
US (1) | US5611928A (en) |
EP (1) | EP0672022B1 (en) |
AT (1) | ATE178291T1 (en) |
AU (1) | AU5565594A (en) |
CA (1) | CA2150675C (en) |
DE (1) | DE69324262T2 (en) |
ES (1) | ES2130391T3 (en) |
FI (1) | FI97219C (en) |
WO (1) | WO1994013591A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6083398A (en) * | 1996-12-02 | 2000-07-04 | Solvay (Societe Anonyme) | Process for the decoloration and detoxification of aqueous effluents |
WO2004028983A1 (en) * | 2002-09-27 | 2004-04-08 | Shanghai Gi Biotechnology Engineering Co., Ltd. | A method of processing organic wastewater |
US20110127220A1 (en) * | 2007-12-20 | 2011-06-02 | Otv Sa | Method for Treating Water by Advanced Oxidation and Ballasted Flocculation, and Corresponding Treatment Plant |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FI97219C (en) * | 1992-12-04 | 1998-07-14 | Kemira Oy | Waste water purification process |
US5626717A (en) * | 1995-06-01 | 1997-05-06 | International Paper Company | Oxidative treatment of bleach plant effluent |
FR2737719B1 (en) * | 1995-08-07 | 1997-10-24 | Burgand Yves | ORGANO-MINERAL PASTE AND USE THEREOF AS A CONSTRUCTION MATERIAL |
US6569284B1 (en) | 1996-09-24 | 2003-05-27 | International Paper Company | Elemental-chlorine-free bleaching process having an initial Eo or Eop stage |
WO2011119423A2 (en) | 2010-03-23 | 2011-09-29 | International Paper Company | Improved bctmp filtrate recycling system and method |
CN101913729B (en) * | 2010-07-20 | 2012-05-23 | 江苏华杉环保科技有限公司 | Denitrification additive for treating urea-containing wastewater and preparation method thereof |
Citations (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2118486A1 (en) * | 1970-04-10 | 1971-10-28 | Kurita Water Ind Ltd | Process for purifying water that contains organic substances |
DE2521893A1 (en) * | 1974-05-17 | 1975-11-20 | Sca Development Ab | METHOD FOR TREATMENT OF WASTE WATER |
JPS532944A (en) * | 1976-06-29 | 1978-01-12 | Ebara Infilco Co Ltd | Process for treating organic dirty water |
JPS53120231A (en) * | 1977-03-30 | 1978-10-20 | Hitachi Ltd | Display pattern generator circuit for crt display |
CH613917A5 (en) * | 1975-06-10 | 1979-10-31 | Schweizerische Sodafabrik | Process for purifying waste water or for treating water |
JPS56155693A (en) * | 1980-05-01 | 1981-12-01 | Ebara Infilco Co Ltd | Treatment of dense organic waste liquid |
JPS5724693A (en) * | 1980-07-18 | 1982-02-09 | Ebara Infilco Co Ltd | Disposal of organic waste water |
JPS5724692A (en) * | 1980-07-18 | 1982-02-09 | Ebara Infilco Co Ltd | Disposal of organic waste water |
JPS60261590A (en) * | 1984-06-08 | 1985-12-24 | Murata Sangyo Kk | Treatment of waste water containing chlorinated hydrocarbon |
DE3840323A1 (en) * | 1988-11-30 | 1990-05-31 | Gelsenwasser Ag | PROCESS FOR REMOVING ORGANIC COMPOUNDS FROM WATER |
EP0419842A1 (en) * | 1989-09-27 | 1991-04-03 | Degussa Aktiengesellschaft | Method for removing halogenated organic contaminants with at least 5 C-atoms from water |
FI925506L (en) * | 1992-12-04 | 1994-06-05 | Kemira Oy | Method for purifying wastewater |
-
1992
- 1992-12-04 FI FI925506A patent/FI97219C/en not_active IP Right Cessation
-
1993
- 1993-12-03 ES ES94900852T patent/ES2130391T3/en not_active Expired - Lifetime
- 1993-12-03 CA CA002150675A patent/CA2150675C/en not_active Expired - Fee Related
- 1993-12-03 WO PCT/FI1993/000524 patent/WO1994013591A1/en active IP Right Grant
- 1993-12-03 AT AT94900852T patent/ATE178291T1/en active
- 1993-12-03 US US08/454,316 patent/US5611928A/en not_active Expired - Lifetime
- 1993-12-03 DE DE69324262T patent/DE69324262T2/en not_active Expired - Lifetime
- 1993-12-03 EP EP19940900852 patent/EP0672022B1/en not_active Expired - Lifetime
- 1993-12-03 AU AU55655/94A patent/AU5565594A/en not_active Abandoned
Patent Citations (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2118486A1 (en) * | 1970-04-10 | 1971-10-28 | Kurita Water Ind Ltd | Process for purifying water that contains organic substances |
DE2521893A1 (en) * | 1974-05-17 | 1975-11-20 | Sca Development Ab | METHOD FOR TREATMENT OF WASTE WATER |
CH613917A5 (en) * | 1975-06-10 | 1979-10-31 | Schweizerische Sodafabrik | Process for purifying waste water or for treating water |
JPS532944A (en) * | 1976-06-29 | 1978-01-12 | Ebara Infilco Co Ltd | Process for treating organic dirty water |
JPS53120231A (en) * | 1977-03-30 | 1978-10-20 | Hitachi Ltd | Display pattern generator circuit for crt display |
JPS56155693A (en) * | 1980-05-01 | 1981-12-01 | Ebara Infilco Co Ltd | Treatment of dense organic waste liquid |
JPS5724693A (en) * | 1980-07-18 | 1982-02-09 | Ebara Infilco Co Ltd | Disposal of organic waste water |
JPS5724692A (en) * | 1980-07-18 | 1982-02-09 | Ebara Infilco Co Ltd | Disposal of organic waste water |
JPS60261590A (en) * | 1984-06-08 | 1985-12-24 | Murata Sangyo Kk | Treatment of waste water containing chlorinated hydrocarbon |
DE3840323A1 (en) * | 1988-11-30 | 1990-05-31 | Gelsenwasser Ag | PROCESS FOR REMOVING ORGANIC COMPOUNDS FROM WATER |
EP0419842A1 (en) * | 1989-09-27 | 1991-04-03 | Degussa Aktiengesellschaft | Method for removing halogenated organic contaminants with at least 5 C-atoms from water |
FI925506L (en) * | 1992-12-04 | 1994-06-05 | Kemira Oy | Method for purifying wastewater |
Non-Patent Citations (3)
Title |
---|
Kankyo Eng. KK., "Pretreating organic effluent--to remove organic and colouring materials", JP 55047199, A, 880403, 8020 (Basic). |
Kankyo Eng. KK., Pretreating organic effluent to remove organic and colouring materials , JP 55047199, A, 880403, 8020 (Basic). * |
Search Report for Finnish Appl. No. 925506, filed Dec. 7 1995 dated Jul. 10, 1995. * |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6083398A (en) * | 1996-12-02 | 2000-07-04 | Solvay (Societe Anonyme) | Process for the decoloration and detoxification of aqueous effluents |
WO2004028983A1 (en) * | 2002-09-27 | 2004-04-08 | Shanghai Gi Biotechnology Engineering Co., Ltd. | A method of processing organic wastewater |
US20110127220A1 (en) * | 2007-12-20 | 2011-06-02 | Otv Sa | Method for Treating Water by Advanced Oxidation and Ballasted Flocculation, and Corresponding Treatment Plant |
US8663478B2 (en) * | 2007-12-20 | 2014-03-04 | Veolia Water Solutions & Technologies Support | Method for treating water by advanced oxidation and ballasted flocculation, and corresponding treatment plant |
Also Published As
Publication number | Publication date |
---|---|
FI925506A0 (en) | 1992-12-04 |
ES2130391T3 (en) | 1999-07-01 |
AU5565594A (en) | 1994-07-04 |
FI97219C (en) | 1998-07-14 |
WO1994013591A1 (en) | 1994-06-23 |
ATE178291T1 (en) | 1999-04-15 |
EP0672022B1 (en) | 1999-03-31 |
FI97219B (en) | 1996-07-31 |
CA2150675A1 (en) | 1994-06-23 |
DE69324262D1 (en) | 1999-05-06 |
DE69324262T2 (en) | 1999-11-11 |
FI925506L (en) | 1994-06-05 |
CA2150675C (en) | 2005-05-10 |
EP0672022A1 (en) | 1995-09-20 |
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